Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 158
NWS STORM PREDICTION CENTER NORMAN OK
1055 PM CDT FRI MAY 10 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH TEXAS
* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1055 PM
UNTIL 500 AM CDT.
* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES EITHER SIDE OF A LINE FROM 75 MILES WEST NORTHWEST
OF MCALLEN TEXAS TO 35 MILES NORTH NORTHEAST OF MCALLEN TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 157...
DISCUSSION...SEVERE THUNDERSTORMS ARE MOVING TOWARD WESTERN PARTS OF
SOUTH TEXAS. A MODERATELY UNSTABLE AIRMASS WITH STRONG DEEP LAYER
SHEAR EXISTS ACROSS SOUTH TEXAS. THIS ENVIRONMENT SHOULD SUPPORT
SEVERE THUNDERSTORM DEVELOPMENT DURING THE LATE EVENING AND
OVERNIGHT PERIOD WITH LARGE HAIL AND WIND DAMAGE POSSIBLE.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29030.
...BROYLES
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 158 SEVERE TSTM TX 110355Z - 111000Z
AXIS..45 STATUTE MILES EITHER SIDE OF LINE..
75WNW MFE/MCALLEN TX/ - 35NNE MFE/MCALLEN TX/
..AVIATION COORDS.. 40NM EITHER SIDE /54S LRD - 55NW BRO/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 29030.
LAT...LON 27239937 27299804 26009798 25949933
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 158 Status Report Messages:
STATUS REPORT #2 ON WW 158
VALID 110745Z - 110840Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 75 WSW MFE
TO 35 SSW ALI.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 629
..DIAL..05/11/13
ATTN...WFO...BRO...
&&
STATUS REPORT FOR WS 158
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TXC047-215-427-110840-
TX
. TEXAS COUNTIES INCLUDED ARE
BROOKS HIDALGO STARR
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 158
VALID 110540Z - 110640Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..DIAL..05/11/13
ATTN...WFO...BRO...
&&
STATUS REPORT FOR WS 158
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TXC047-215-247-427-505-110640-
TX
. TEXAS COUNTIES INCLUDED ARE
BROOKS HIDALGO JIM HOGG
STARR ZAPATA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (<5%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Mod (40%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
weather.gov 
@NWSSPC
